git: 2d0600671a5d - stable/15 - tools.build: add sys/cdefs.h to SYSINCS, since lots of other headers use it

The branch stable/15 has been updated by dim:

URL: https://cgit.FreeBSD.org/src/commit/?id=2d0600671a5d7abed848c3bad2ab6601e048b3b4

commit 2d0600671a5d7abed848c3bad2ab6601e048b3b4
Author:     Dimitry Andric <dim@FreeBSD.org>
AuthorDate: 2025-12-26 15:26:13 +0000
Commit:     Dimitry Andric <dim@FreeBSD.org>
CommitDate: 2025-12-29 12:14:46 +0000

    tools.build: add sys/cdefs.h to SYSINCS, since lots of other headers use it
    
    This is needed to let the legacy stage compile against newer versions of
    sys/font.h, which transitively includes sys/cdefs.h, and requires the
    new __nonstring macro from it.
    
    Fixes:          e2c93ed09f25
    MFC after:      3 days
    
    (cherry picked from commit 1c9ff80f06350fa44b7e50ce09ad665ab0082abb)
---
 tools/build/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/build/Makefile b/tools/build/Makefile
index bff73fc715ef..e057f0b6c400 100644
--- a/tools/build/Makefile
+++ b/tools/build/Makefile
@@ -347,6 +347,10 @@ MSDOSFSINCS+=	${SRCTOP}/sys/fs/msdosfs/fat.h
 MSDOSFSINCS+=	${SRCTOP}/sys/fs/msdosfs/msdosfsmount.h
 DISKINCS+=	${SRCTOP}/sys/sys/disk/bsd.h
 
+# Needed to build most of the things below, which include sys/cdefs.h either
+# directly or transitively
+SYSINCS+=	${SRCTOP}/sys/sys/cdefs.h
+
 # Needed to build config (since it uses libnv)
 SYSINCS+=	${SRCTOP}/sys/sys/_nv.h
 SYSINCS+=	${SRCTOP}/sys/sys/nv.h ${SRCTOP}/sys/sys/cnv.h \